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Search Results: 1 - 10 of 1496 matches for " Daisuke Umemoto "
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The Relationship between Beliefs in Cooperation, Motivation, and Engagement in Cooperative Learning  [PDF]
Takatoyo Umemoto, Naoya Yada
Psychology (PSYCH) , 2016, DOI: 10.4236/psych.2016.710135
Abstract: This study examined the relationship between beliefs in cooperation, motivation and engagement in cooperative learning. Beliefs in cooperation have three subscales: usefulness of cooperation, individual orientation and inequity. Self-reported questionnaire was administered to 181 undergraduate students at two universities. The results of path analysis indicated that usefulness of cooperation positively predicted self-efficacy and intrinsic value. Moreover, self-efficacy and intrinsic value positively predicted behavioral engagement, and intrinsic value positively predicted emotional engagement. On the other hand, individual orientation negatively predicted intrinsic value and inequity did not predict any motivational factors. The effects of beliefs in cooperation on cooperative learning process were discussed in light of the current findings.
Growth rates of cocompact hyperbolic Coxeter groups and 2-Salem numbers
Yuriko Umemoto
Mathematics , 2013, DOI: 10.2140/agt.2014.14.2721
Abstract: By the results of Cannon, Wagreich and Parry, it is known that the growth rate of a cocompact Coxeter group in 2-dimensional hyperbolic space $H^2$ and 3-dimensional hyperbolic space $H^3$ is a Salem number. Kerada defined a j-Salem number, which is a generalization of a Salem number. In this paper, we realize infinitely many 2-Salem numbers as the growth rates of cocompact Coxeter groups in 4-dimensional hyperbolic space $H ^4$. Our Coxeter polytopes are constructed by successive gluing of Coxeter polytopes which we call Coxeter dominoes.
The Banach-Tarski paradox for flag manifolds
Yohei Komori,Yuriko Umemoto
Mathematics , 2011,
Abstract: The famous Banach-Tarski paradox claims that the three dimensional rotation group acts on the two dimensional sphere paradoxically. In this paper, we generalize their result to show that the classical group acts on the flag manifold paradoxically.
On 3-dimensional hyperbolic Coxeter pyramids
Yohei Komori,Yuriko Umemoto
Mathematics , 2015,
Abstract: After classifying 3-dimensional hyperbolic Coxeter pyramids by means of elementary plane geometry, we calculate growth functions of corresponding Coxeter groups by using Steinberg formula and conclude that growth rates of them are always Perron numbers. We also calculate hyperbolic volumes of them and compare volumes with their growth rates. Finally we consider a geometric ordering of Coxeter pyramids comparable with their growth rates.
Consideration on Poverty Problem of Young People in Industrialized Countries and Their Solutions  [PDF]
Daisuke Hirahara
Modern Economy (ME) , 2018, DOI: 10.4236/me.2018.91013
Abstract: Increase of irregular workers called working-poor is a problem. This unstable employment makes the poor more poverty. The possibility that a simple work is deprived by the development of artificial intelligence is increasing. From this background, restructuring of social structure and policies become important. In Japan, as the declining birthrate and aging population progresses, there is concern that more people need medical care and nursing care services, so increasing social security expenses is also a problem.
Comparison between 3D-IR-BTFE Method and Conventional Method in Contrast Head MRI Examination  [PDF]
Daisuke Hirahara
Open Journal of Medical Imaging (OJMI) , 2018, DOI: 10.4236/ojmi.2018.83005
Abstract: MRI using gadolinium contrast media is useful in diagnosis; however, nephrogenic systemic fibrosis is a serious side effect of gadolinium exposure. Moreover, it turns out that gadolinium deposits in the brain. This has escalated the necessity for a suitable method to use gadolinium contrast media. I developed a new imaging method that had excellent contrast. This study examined the usefulness of that new imaging method and found the method is highly effective.
An Inhibitory Sex Pheromone Tastes Bitter for Drosophila Males
Fabien Lacaille, Makoto Hiroi, Robert Twele, Tsuyoshi Inoshita, Daisuke Umemoto, Gérard Manière, Frédéric Marion-Poll, Mamiko Ozaki, Wittko Francke, Matthew Cobb, Claude Everaerts, Teiichi Tanimura, Jean-Fran?ois Ferveur
PLOS ONE , 2007, DOI: 10.1371/journal.pone.0000661
Abstract: Sexual behavior requires animals to distinguish between the sexes and to respond appropriately to each of them. In Drosophila melanogaster, as in many insects, cuticular hydrocarbons are thought to be involved in sex recognition and in mating behavior, but there is no direct neuronal evidence of their pheromonal effect. Using behavioral and electrophysiological measures of responses to natural and synthetic compounds, we show that Z-7-tricosene, a Drosophila male cuticular hydrocarbon, acts as a sex pheromone and inhibits male-male courtship. These data provide the first direct demonstration that an insect cuticular hydrocarbon is detected as a sex pheromone. Intriguingly, we show that a particular type of gustatory neurons of the labial palps respond both to Z-7-tricosene and to bitter stimuli. Cross-adaptation between Z-7-tricosene and bitter stimuli further indicates that these two very different substances are processed by the same neural pathways. Furthermore, the two substances induced similar behavioral responses both in courtship and feeding tests. We conclude that the inhibitory pheromone tastes bitter to the fly.
Effect That Lifestyle during the Growth Period Has on Bone Density Acquisition—Using Simple Exercise and a Nutrition Survey  [PDF]
Fumihiro Omasu, Misaki Umemoto, Riko Gotanda, Tomomi Gotoh
Open Journal of Preventive Medicine (OJPM) , 2017, DOI: 10.4236/ojpm.2017.75008
Abstract: This survey was conducted with the aim of clarifying and providing guidance regarding correct lifestyle and exercise habits from adolescence in order to prevent the development of osteoporosis. The subjects included 195 Japanese adult females. We measured their calcaneal bone density by ultrasonography, the index of which was determined as SOS (Speed of Sound). We examined their physical characteristics, health conditions, amount of physical activity, exercise history, and eating habits, and then analyzed the relationship thereof with bone density. No significant correlation was found between height, weight, BMI (Body Mass Index), or body fat percentage and the SOS value. Moreover, the bone density among those with a history of exercise was high. Breaking it down, we obtained results such as the fact that exercise habits during the junior and senior high school years had a great impact on the acquisition of peak bone mass, although no relationship between exercise habits and bone density was found during the elementary school years. Furthermore, as the bone density of students who continued exercising in junior and senior high school indicated high values, continuity of exercise during the growth period (during puberty) is believed to have a great impact on peak bone mass. Upon investigating the content of meals including foods which have a positive impact on the bones, “bean and bean products” and “green and yellow vegetables” were found to be related to bone density. From the above, the effect that the lifestyle of young adult females had on bone density was partially clarified. In particular, one factor which had a strong relationship with current bone density was exercise history during the junior and senior high school periods. It was clarified that continuously engaging in exercise and placing strain on the bones during these periods lead to high bone density acquisition.
Carbon Dioxide Emissions and Energy Self-Sufficiency of Woody Biomass Utilization for Residential Heating: A Case Study of Nishiwaga, Japan  [PDF]
Daisuke Sawauchi, Daisuke Kunii, Yasutaka Yamamoto
Journal of Environmental Protection (JEP) , 2015, DOI: 10.4236/jep.2015.64032
Abstract: Renewable energy sources, including bioenergy, are presently attracting considerable attention as possible substitutes for fossil fuels. Among the various sources of bioenergy, biomass can arguably play a significant role in the reduction of greenhouse gases and the provision of a stable energy supply. However, the use of fossil fuels continues in the production of bioenergy. Consequently, the overall extent to which biomass utilization for energy can reduce carbon dioxide emissions as a substitute for fossil fuels and whether this can improve the energy self-sufficiency rate remains largely unknown. This study responds to these questions using a case of a Japanese rural community using firewood for residential heating. The results showed that woody biomass utilization for energy is able to both reduce the dependence on fossil fuels and mitigate climate change. These findings offer new insights into the development of sustainability in rural communities.
Claisen and Intermolecular Rearrangement of Cinnamyloxynaphthalenes  [PDF]
Yutaka Okada, Daisuke Imanari
International Journal of Organic Chemistry (IJOC) , 2012, DOI: 10.4236/ijoc.2012.21007
Abstract: Rearrangements of the 1- and 2-cinnamyloxynaphthalenes undergo in diethylene glycol and decalin with solvent de-pendence. In 2-cinnamyloxynaphthalene, the Claisen rearrangement occurs regardless of the solvents. However, for the 1-analogue, the Claisen rearrangement occurs in decalin, while both the Claisen and intermolecular rearrangements occur at higher temperatures in diethylene glycol.
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